12bad8471SEric Van Hensbergen /* 22bad8471SEric Van Hensbergen * linux/fs/9p/vfs_inode.c 32bad8471SEric Van Hensbergen * 473c592b9SEric Van Hensbergen * This file contains vfs inode ops for the 9P2000 protocol. 52bad8471SEric Van Hensbergen * 62bad8471SEric Van Hensbergen * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> 72bad8471SEric Van Hensbergen * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> 82bad8471SEric Van Hensbergen * 92bad8471SEric Van Hensbergen * This program is free software; you can redistribute it and/or modify 1042e8c509SEric Van Hensbergen * it under the terms of the GNU General Public License version 2 1142e8c509SEric Van Hensbergen * as published by the Free Software Foundation. 122bad8471SEric Van Hensbergen * 132bad8471SEric Van Hensbergen * This program is distributed in the hope that it will be useful, 142bad8471SEric Van Hensbergen * but WITHOUT ANY WARRANTY; without even the implied warranty of 152bad8471SEric Van Hensbergen * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 162bad8471SEric Van Hensbergen * GNU General Public License for more details. 172bad8471SEric Van Hensbergen * 182bad8471SEric Van Hensbergen * You should have received a copy of the GNU General Public License 192bad8471SEric Van Hensbergen * along with this program; if not, write to: 202bad8471SEric Van Hensbergen * Free Software Foundation 212bad8471SEric Van Hensbergen * 51 Franklin Street, Fifth Floor 222bad8471SEric Van Hensbergen * Boston, MA 02111-1301 USA 232bad8471SEric Van Hensbergen * 242bad8471SEric Van Hensbergen */ 252bad8471SEric Van Hensbergen 262bad8471SEric Van Hensbergen #include <linux/module.h> 272bad8471SEric Van Hensbergen #include <linux/errno.h> 282bad8471SEric Van Hensbergen #include <linux/fs.h> 292bad8471SEric Van Hensbergen #include <linux/file.h> 302bad8471SEric Van Hensbergen #include <linux/pagemap.h> 312bad8471SEric Van Hensbergen #include <linux/stat.h> 322bad8471SEric Van Hensbergen #include <linux/string.h> 332bad8471SEric Van Hensbergen #include <linux/inet.h> 342bad8471SEric Van Hensbergen #include <linux/namei.h> 352bad8471SEric Van Hensbergen #include <linux/idr.h> 36e8edc6e0SAlexey Dobriyan #include <linux/sched.h> 375a0e3ad6STejun Heo #include <linux/slab.h> 38ebf46264SAneesh Kumar K.V #include <linux/xattr.h> 3985ff872dSAneesh Kumar K.V #include <linux/posix_acl.h> 40bd238fb4SLatchesar Ionkov #include <net/9p/9p.h> 41bd238fb4SLatchesar Ionkov #include <net/9p/client.h> 422bad8471SEric Van Hensbergen 432bad8471SEric Van Hensbergen #include "v9fs.h" 442bad8471SEric Van Hensbergen #include "v9fs_vfs.h" 452bad8471SEric Van Hensbergen #include "fid.h" 4660e78d2cSAbhishek Kulkarni #include "cache.h" 47ebf46264SAneesh Kumar K.V #include "xattr.h" 4885ff872dSAneesh Kumar K.V #include "acl.h" 492bad8471SEric Van Hensbergen 50754661f1SArjan van de Ven static const struct inode_operations v9fs_dir_inode_operations; 519b6533c9SSripathi Kodi static const struct inode_operations v9fs_dir_inode_operations_dotu; 52754661f1SArjan van de Ven static const struct inode_operations v9fs_file_inode_operations; 53754661f1SArjan van de Ven static const struct inode_operations v9fs_symlink_inode_operations; 54f5fc6145SAneesh Kumar K.V 552bad8471SEric Van Hensbergen /** 562bad8471SEric Van Hensbergen * unixmode2p9mode - convert unix mode bits to plan 9 572bad8471SEric Van Hensbergen * @v9ses: v9fs session information 582bad8471SEric Van Hensbergen * @mode: mode to convert 592bad8471SEric Van Hensbergen * 602bad8471SEric Van Hensbergen */ 612bad8471SEric Van Hensbergen 6273c592b9SEric Van Hensbergen static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode) 632bad8471SEric Van Hensbergen { 642bad8471SEric Van Hensbergen int res; 652bad8471SEric Van Hensbergen res = mode & 0777; 662bad8471SEric Van Hensbergen if (S_ISDIR(mode)) 67bd238fb4SLatchesar Ionkov res |= P9_DMDIR; 68dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 692bad8471SEric Van Hensbergen if (S_ISLNK(mode)) 70bd238fb4SLatchesar Ionkov res |= P9_DMSYMLINK; 712bad8471SEric Van Hensbergen if (v9ses->nodev == 0) { 722bad8471SEric Van Hensbergen if (S_ISSOCK(mode)) 73bd238fb4SLatchesar Ionkov res |= P9_DMSOCKET; 742bad8471SEric Van Hensbergen if (S_ISFIFO(mode)) 75bd238fb4SLatchesar Ionkov res |= P9_DMNAMEDPIPE; 762bad8471SEric Van Hensbergen if (S_ISBLK(mode)) 77bd238fb4SLatchesar Ionkov res |= P9_DMDEVICE; 782bad8471SEric Van Hensbergen if (S_ISCHR(mode)) 79bd238fb4SLatchesar Ionkov res |= P9_DMDEVICE; 802bad8471SEric Van Hensbergen } 812bad8471SEric Van Hensbergen 822bad8471SEric Van Hensbergen if ((mode & S_ISUID) == S_ISUID) 83bd238fb4SLatchesar Ionkov res |= P9_DMSETUID; 842bad8471SEric Van Hensbergen if ((mode & S_ISGID) == S_ISGID) 85bd238fb4SLatchesar Ionkov res |= P9_DMSETGID; 86d199d652SAnthony Liguori if ((mode & S_ISVTX) == S_ISVTX) 87d199d652SAnthony Liguori res |= P9_DMSETVTX; 88bd238fb4SLatchesar Ionkov if ((mode & P9_DMLINK)) 89bd238fb4SLatchesar Ionkov res |= P9_DMLINK; 902bad8471SEric Van Hensbergen } 912bad8471SEric Van Hensbergen 922bad8471SEric Van Hensbergen return res; 932bad8471SEric Van Hensbergen } 942bad8471SEric Van Hensbergen 952bad8471SEric Van Hensbergen /** 962bad8471SEric Van Hensbergen * p9mode2unixmode- convert plan9 mode bits to unix mode bits 972bad8471SEric Van Hensbergen * @v9ses: v9fs session information 982bad8471SEric Van Hensbergen * @mode: mode to convert 992bad8471SEric Van Hensbergen * 1002bad8471SEric Van Hensbergen */ 1012bad8471SEric Van Hensbergen 10273c592b9SEric Van Hensbergen static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode) 1032bad8471SEric Van Hensbergen { 1042bad8471SEric Van Hensbergen int res; 1052bad8471SEric Van Hensbergen 1062bad8471SEric Van Hensbergen res = mode & 0777; 1072bad8471SEric Van Hensbergen 108bd238fb4SLatchesar Ionkov if ((mode & P9_DMDIR) == P9_DMDIR) 1092bad8471SEric Van Hensbergen res |= S_IFDIR; 110dd6102fbSSripathi Kodi else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses))) 1112bad8471SEric Van Hensbergen res |= S_IFLNK; 112dd6102fbSSripathi Kodi else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses)) 1132bad8471SEric Van Hensbergen && (v9ses->nodev == 0)) 1142bad8471SEric Van Hensbergen res |= S_IFSOCK; 115dd6102fbSSripathi Kodi else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses)) 1162bad8471SEric Van Hensbergen && (v9ses->nodev == 0)) 1172bad8471SEric Van Hensbergen res |= S_IFIFO; 118dd6102fbSSripathi Kodi else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses)) 1192bad8471SEric Van Hensbergen && (v9ses->nodev == 0)) 1202bad8471SEric Van Hensbergen res |= S_IFBLK; 1212bad8471SEric Van Hensbergen else 1222bad8471SEric Van Hensbergen res |= S_IFREG; 1232bad8471SEric Van Hensbergen 124dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 125bd238fb4SLatchesar Ionkov if ((mode & P9_DMSETUID) == P9_DMSETUID) 1262bad8471SEric Van Hensbergen res |= S_ISUID; 1272bad8471SEric Van Hensbergen 128bd238fb4SLatchesar Ionkov if ((mode & P9_DMSETGID) == P9_DMSETGID) 1292bad8471SEric Van Hensbergen res |= S_ISGID; 130d199d652SAnthony Liguori 131d199d652SAnthony Liguori if ((mode & P9_DMSETVTX) == P9_DMSETVTX) 132d199d652SAnthony Liguori res |= S_ISVTX; 1332bad8471SEric Van Hensbergen } 1342bad8471SEric Van Hensbergen 1352bad8471SEric Van Hensbergen return res; 1362bad8471SEric Van Hensbergen } 1372bad8471SEric Van Hensbergen 138ee443996SEric Van Hensbergen /** 139ee443996SEric Van Hensbergen * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits 140ee443996SEric Van Hensbergen * @uflags: flags to convert 1412e4bef41SEric Van Hensbergen * @extended: if .u extensions are active 142ee443996SEric Van Hensbergen */ 143ee443996SEric Van Hensbergen 1442e4bef41SEric Van Hensbergen int v9fs_uflags2omode(int uflags, int extended) 1456a3124a3SLatchesar Ionkov { 1466a3124a3SLatchesar Ionkov int ret; 1476a3124a3SLatchesar Ionkov 1486a3124a3SLatchesar Ionkov ret = 0; 1496a3124a3SLatchesar Ionkov switch (uflags&3) { 1506a3124a3SLatchesar Ionkov default: 1516a3124a3SLatchesar Ionkov case O_RDONLY: 152bd238fb4SLatchesar Ionkov ret = P9_OREAD; 1536a3124a3SLatchesar Ionkov break; 1546a3124a3SLatchesar Ionkov 1556a3124a3SLatchesar Ionkov case O_WRONLY: 156bd238fb4SLatchesar Ionkov ret = P9_OWRITE; 1576a3124a3SLatchesar Ionkov break; 1586a3124a3SLatchesar Ionkov 1596a3124a3SLatchesar Ionkov case O_RDWR: 160bd238fb4SLatchesar Ionkov ret = P9_ORDWR; 1616a3124a3SLatchesar Ionkov break; 1626a3124a3SLatchesar Ionkov } 1636a3124a3SLatchesar Ionkov 1646a3124a3SLatchesar Ionkov if (uflags & O_TRUNC) 165bd238fb4SLatchesar Ionkov ret |= P9_OTRUNC; 1666a3124a3SLatchesar Ionkov 1672e4bef41SEric Van Hensbergen if (extended) { 1682e4bef41SEric Van Hensbergen if (uflags & O_EXCL) 1692e4bef41SEric Van Hensbergen ret |= P9_OEXCL; 1702e4bef41SEric Van Hensbergen 1716a3124a3SLatchesar Ionkov if (uflags & O_APPEND) 172bd238fb4SLatchesar Ionkov ret |= P9_OAPPEND; 1732e4bef41SEric Van Hensbergen } 1746a3124a3SLatchesar Ionkov 1756a3124a3SLatchesar Ionkov return ret; 1766a3124a3SLatchesar Ionkov } 1776a3124a3SLatchesar Ionkov 1782bad8471SEric Van Hensbergen /** 179531b1094SLatchesar Ionkov * v9fs_blank_wstat - helper function to setup a 9P stat structure 180531b1094SLatchesar Ionkov * @wstat: structure to initialize 1812bad8471SEric Van Hensbergen * 1822bad8471SEric Van Hensbergen */ 1832bad8471SEric Van Hensbergen 1847a4439c4SM. Mohan Kumar void 185bd238fb4SLatchesar Ionkov v9fs_blank_wstat(struct p9_wstat *wstat) 1862bad8471SEric Van Hensbergen { 187531b1094SLatchesar Ionkov wstat->type = ~0; 188531b1094SLatchesar Ionkov wstat->dev = ~0; 189531b1094SLatchesar Ionkov wstat->qid.type = ~0; 190531b1094SLatchesar Ionkov wstat->qid.version = ~0; 191531b1094SLatchesar Ionkov *((long long *)&wstat->qid.path) = ~0; 192531b1094SLatchesar Ionkov wstat->mode = ~0; 193531b1094SLatchesar Ionkov wstat->atime = ~0; 194531b1094SLatchesar Ionkov wstat->mtime = ~0; 195531b1094SLatchesar Ionkov wstat->length = ~0; 196531b1094SLatchesar Ionkov wstat->name = NULL; 197531b1094SLatchesar Ionkov wstat->uid = NULL; 198531b1094SLatchesar Ionkov wstat->gid = NULL; 199531b1094SLatchesar Ionkov wstat->muid = NULL; 200531b1094SLatchesar Ionkov wstat->n_uid = ~0; 201531b1094SLatchesar Ionkov wstat->n_gid = ~0; 202531b1094SLatchesar Ionkov wstat->n_muid = ~0; 203531b1094SLatchesar Ionkov wstat->extension = NULL; 2042bad8471SEric Van Hensbergen } 2052bad8471SEric Van Hensbergen 20660e78d2cSAbhishek Kulkarni /** 20760e78d2cSAbhishek Kulkarni * v9fs_alloc_inode - helper function to allocate an inode 20860e78d2cSAbhishek Kulkarni * 20960e78d2cSAbhishek Kulkarni */ 21060e78d2cSAbhishek Kulkarni struct inode *v9fs_alloc_inode(struct super_block *sb) 21160e78d2cSAbhishek Kulkarni { 212a78ce05dSAneesh Kumar K.V struct v9fs_inode *v9inode; 213a78ce05dSAneesh Kumar K.V v9inode = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache, 21460e78d2cSAbhishek Kulkarni GFP_KERNEL); 215a78ce05dSAneesh Kumar K.V if (!v9inode) 21660e78d2cSAbhishek Kulkarni return NULL; 217a78ce05dSAneesh Kumar K.V #ifdef CONFIG_9P_FSCACHE 218a78ce05dSAneesh Kumar K.V v9inode->fscache = NULL; 219a78ce05dSAneesh Kumar K.V v9inode->fscache_key = NULL; 220a78ce05dSAneesh Kumar K.V spin_lock_init(&v9inode->fscache_lock); 221a78ce05dSAneesh Kumar K.V #endif 2226b39f6d2SAneesh Kumar K.V v9inode->writeback_fid = NULL; 223a78ce05dSAneesh Kumar K.V return &v9inode->vfs_inode; 22460e78d2cSAbhishek Kulkarni } 22560e78d2cSAbhishek Kulkarni 22660e78d2cSAbhishek Kulkarni /** 22760e78d2cSAbhishek Kulkarni * v9fs_destroy_inode - destroy an inode 22860e78d2cSAbhishek Kulkarni * 22960e78d2cSAbhishek Kulkarni */ 23060e78d2cSAbhishek Kulkarni 231fa0d7e3dSNick Piggin static void v9fs_i_callback(struct rcu_head *head) 232fa0d7e3dSNick Piggin { 233fa0d7e3dSNick Piggin struct inode *inode = container_of(head, struct inode, i_rcu); 234fa0d7e3dSNick Piggin INIT_LIST_HEAD(&inode->i_dentry); 235a78ce05dSAneesh Kumar K.V kmem_cache_free(v9fs_inode_cache, V9FS_I(inode)); 236fa0d7e3dSNick Piggin } 237fa0d7e3dSNick Piggin 23860e78d2cSAbhishek Kulkarni void v9fs_destroy_inode(struct inode *inode) 23960e78d2cSAbhishek Kulkarni { 240fa0d7e3dSNick Piggin call_rcu(&inode->i_rcu, v9fs_i_callback); 24160e78d2cSAbhishek Kulkarni } 24260e78d2cSAbhishek Kulkarni 2435ffc0cb3SAneesh Kumar K.V int v9fs_init_inode(struct v9fs_session_info *v9ses, 2445ffc0cb3SAneesh Kumar K.V struct inode *inode, int mode) 2452bad8471SEric Van Hensbergen { 2465ffc0cb3SAneesh Kumar K.V int err = 0; 2472bb54115SAbhishek Kulkarni 248217f206dSDmitry Monakhov inode_init_owner(inode, NULL, mode); 2492bad8471SEric Van Hensbergen inode->i_blocks = 0; 2502bad8471SEric Van Hensbergen inode->i_rdev = 0; 2512bad8471SEric Van Hensbergen inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 252147b31cfSEric Van Hensbergen inode->i_mapping->a_ops = &v9fs_addr_operations; 2532bad8471SEric Van Hensbergen 2542bad8471SEric Van Hensbergen switch (mode & S_IFMT) { 2552bad8471SEric Van Hensbergen case S_IFIFO: 2562bad8471SEric Van Hensbergen case S_IFBLK: 2572bad8471SEric Van Hensbergen case S_IFCHR: 2582bad8471SEric Van Hensbergen case S_IFSOCK: 2594b43516aSM. Mohan Kumar if (v9fs_proto_dotl(v9ses)) { 2604b43516aSM. Mohan Kumar inode->i_op = &v9fs_file_inode_operations_dotl; 2614b43516aSM. Mohan Kumar inode->i_fop = &v9fs_file_operations_dotl; 2624b43516aSM. Mohan Kumar } else if (v9fs_proto_dotu(v9ses)) { 2634b43516aSM. Mohan Kumar inode->i_op = &v9fs_file_inode_operations; 2644b43516aSM. Mohan Kumar inode->i_fop = &v9fs_file_operations; 2654b43516aSM. Mohan Kumar } else { 266bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, 267bd238fb4SLatchesar Ionkov "special files without extended mode\n"); 2682bb54115SAbhishek Kulkarni err = -EINVAL; 2692bb54115SAbhishek Kulkarni goto error; 270b501611aSEric Van Hensbergen } 2712bb54115SAbhishek Kulkarni init_special_inode(inode, inode->i_mode, inode->i_rdev); 2725d58bec5SEric Van Hensbergen break; 2732bad8471SEric Van Hensbergen case S_IFREG: 2749b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) { 2759b6533c9SSripathi Kodi inode->i_op = &v9fs_file_inode_operations_dotl; 27629236f4eSAneesh Kumar K.V if (v9ses->cache) 27729236f4eSAneesh Kumar K.V inode->i_fop = 27829236f4eSAneesh Kumar K.V &v9fs_cached_file_operations_dotl; 27929236f4eSAneesh Kumar K.V else 2809b6533c9SSripathi Kodi inode->i_fop = &v9fs_file_operations_dotl; 2819b6533c9SSripathi Kodi } else { 2822bad8471SEric Van Hensbergen inode->i_op = &v9fs_file_inode_operations; 28329236f4eSAneesh Kumar K.V if (v9ses->cache) 28429236f4eSAneesh Kumar K.V inode->i_fop = &v9fs_cached_file_operations; 28529236f4eSAneesh Kumar K.V else 2862bad8471SEric Van Hensbergen inode->i_fop = &v9fs_file_operations; 2879b6533c9SSripathi Kodi } 2889b6533c9SSripathi Kodi 2892bad8471SEric Van Hensbergen break; 290b501611aSEric Van Hensbergen case S_IFLNK: 2919b6533c9SSripathi Kodi if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { 2929b6533c9SSripathi Kodi P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with " 2939b6533c9SSripathi Kodi "legacy protocol.\n"); 2942bb54115SAbhishek Kulkarni err = -EINVAL; 2952bb54115SAbhishek Kulkarni goto error; 296b501611aSEric Van Hensbergen } 2979b6533c9SSripathi Kodi 2989b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 2999b6533c9SSripathi Kodi inode->i_op = &v9fs_symlink_inode_operations_dotl; 3009b6533c9SSripathi Kodi else 301b501611aSEric Van Hensbergen inode->i_op = &v9fs_symlink_inode_operations; 3029b6533c9SSripathi Kodi 303b501611aSEric Van Hensbergen break; 3042bad8471SEric Van Hensbergen case S_IFDIR: 305d8c76e6fSDave Hansen inc_nlink(inode); 3069b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 3079b6533c9SSripathi Kodi inode->i_op = &v9fs_dir_inode_operations_dotl; 3089b6533c9SSripathi Kodi else if (v9fs_proto_dotu(v9ses)) 3099b6533c9SSripathi Kodi inode->i_op = &v9fs_dir_inode_operations_dotu; 310b501611aSEric Van Hensbergen else 3112bad8471SEric Van Hensbergen inode->i_op = &v9fs_dir_inode_operations; 3129b6533c9SSripathi Kodi 3139b6533c9SSripathi Kodi if (v9fs_proto_dotl(v9ses)) 3149b6533c9SSripathi Kodi inode->i_fop = &v9fs_dir_operations_dotl; 3159b6533c9SSripathi Kodi else 3162bad8471SEric Van Hensbergen inode->i_fop = &v9fs_dir_operations; 3179b6533c9SSripathi Kodi 3182bad8471SEric Van Hensbergen break; 3192bad8471SEric Van Hensbergen default: 3202bb54115SAbhishek Kulkarni P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", 3212bad8471SEric Van Hensbergen mode, mode & S_IFMT); 3222bb54115SAbhishek Kulkarni err = -EINVAL; 3232bb54115SAbhishek Kulkarni goto error; 3242bad8471SEric Van Hensbergen } 3252bb54115SAbhishek Kulkarni error: 3265ffc0cb3SAneesh Kumar K.V return err; 3275ffc0cb3SAneesh Kumar K.V 3285ffc0cb3SAneesh Kumar K.V } 3295ffc0cb3SAneesh Kumar K.V 3305ffc0cb3SAneesh Kumar K.V /** 3315ffc0cb3SAneesh Kumar K.V * v9fs_get_inode - helper function to setup an inode 3325ffc0cb3SAneesh Kumar K.V * @sb: superblock 3335ffc0cb3SAneesh Kumar K.V * @mode: mode to setup inode with 3345ffc0cb3SAneesh Kumar K.V * 3355ffc0cb3SAneesh Kumar K.V */ 3365ffc0cb3SAneesh Kumar K.V 3375ffc0cb3SAneesh Kumar K.V struct inode *v9fs_get_inode(struct super_block *sb, int mode) 3385ffc0cb3SAneesh Kumar K.V { 3395ffc0cb3SAneesh Kumar K.V int err; 3405ffc0cb3SAneesh Kumar K.V struct inode *inode; 3415ffc0cb3SAneesh Kumar K.V struct v9fs_session_info *v9ses = sb->s_fs_info; 3425ffc0cb3SAneesh Kumar K.V 3435ffc0cb3SAneesh Kumar K.V P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); 3445ffc0cb3SAneesh Kumar K.V 3455ffc0cb3SAneesh Kumar K.V inode = new_inode(sb); 3465ffc0cb3SAneesh Kumar K.V if (!inode) { 3475ffc0cb3SAneesh Kumar K.V P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n"); 3485ffc0cb3SAneesh Kumar K.V return ERR_PTR(-ENOMEM); 3495ffc0cb3SAneesh Kumar K.V } 3505ffc0cb3SAneesh Kumar K.V err = v9fs_init_inode(v9ses, inode, mode); 3515ffc0cb3SAneesh Kumar K.V if (err) { 3522bb54115SAbhishek Kulkarni iput(inode); 3532bb54115SAbhishek Kulkarni return ERR_PTR(err); 3542bad8471SEric Van Hensbergen } 3555ffc0cb3SAneesh Kumar K.V return inode; 3565ffc0cb3SAneesh Kumar K.V } 3572bad8471SEric Van Hensbergen 358bd238fb4SLatchesar Ionkov /* 3596a3124a3SLatchesar Ionkov static struct v9fs_fid* 3606a3124a3SLatchesar Ionkov v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) 3616a3124a3SLatchesar Ionkov { 3626a3124a3SLatchesar Ionkov int err; 363736c4b85SMika Kukkonen int nfid; 3646a3124a3SLatchesar Ionkov struct v9fs_fid *ret; 3656a3124a3SLatchesar Ionkov struct v9fs_fcall *fcall; 3660b8dd177SLatchesar Ionkov 3676a3124a3SLatchesar Ionkov nfid = v9fs_get_idpool(&v9ses->fidpool); 3686a3124a3SLatchesar Ionkov if (nfid < 0) { 3690b8dd177SLatchesar Ionkov eprintk(KERN_WARNING, "no free fids available\n"); 370731805b4SLatchesar Ionkov return ERR_PTR(-ENOSPC); 3710b8dd177SLatchesar Ionkov } 3720b8dd177SLatchesar Ionkov 3736a3124a3SLatchesar Ionkov err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, 3746a3124a3SLatchesar Ionkov &fcall); 3756a3124a3SLatchesar Ionkov 3766a3124a3SLatchesar Ionkov if (err < 0) { 37741e5a6acSLatchesar Ionkov if (fcall && fcall->id == RWALK) 37841e5a6acSLatchesar Ionkov goto clunk_fid; 37941e5a6acSLatchesar Ionkov 3806a3124a3SLatchesar Ionkov PRINT_FCALL_ERROR("walk error", fcall); 3816a3124a3SLatchesar Ionkov v9fs_put_idpool(nfid, &v9ses->fidpool); 3826a3124a3SLatchesar Ionkov goto error; 3830b8dd177SLatchesar Ionkov } 3846a3124a3SLatchesar Ionkov 3853cf6429aSLatchesar Ionkov kfree(fcall); 3863cf6429aSLatchesar Ionkov fcall = NULL; 3876a3124a3SLatchesar Ionkov ret = v9fs_fid_create(v9ses, nfid); 3886a3124a3SLatchesar Ionkov if (!ret) { 3896a3124a3SLatchesar Ionkov err = -ENOMEM; 3906a3124a3SLatchesar Ionkov goto clunk_fid; 3910b8dd177SLatchesar Ionkov } 3922bad8471SEric Van Hensbergen 3936a3124a3SLatchesar Ionkov err = v9fs_fid_insert(ret, dentry); 3946a3124a3SLatchesar Ionkov if (err < 0) { 3956a3124a3SLatchesar Ionkov v9fs_fid_destroy(ret); 3966a3124a3SLatchesar Ionkov goto clunk_fid; 3976a3124a3SLatchesar Ionkov } 3982bad8471SEric Van Hensbergen 3996a3124a3SLatchesar Ionkov return ret; 4006a3124a3SLatchesar Ionkov 4016a3124a3SLatchesar Ionkov clunk_fid: 4026a3124a3SLatchesar Ionkov v9fs_t_clunk(v9ses, nfid); 4036a3124a3SLatchesar Ionkov 4046a3124a3SLatchesar Ionkov error: 4056a3124a3SLatchesar Ionkov kfree(fcall); 4066a3124a3SLatchesar Ionkov return ERR_PTR(err); 4076a3124a3SLatchesar Ionkov } 408bd238fb4SLatchesar Ionkov */ 4096a3124a3SLatchesar Ionkov 41060e78d2cSAbhishek Kulkarni 41160e78d2cSAbhishek Kulkarni /** 41260e78d2cSAbhishek Kulkarni * v9fs_clear_inode - release an inode 41360e78d2cSAbhishek Kulkarni * @inode: inode to release 41460e78d2cSAbhishek Kulkarni * 41560e78d2cSAbhishek Kulkarni */ 416b57922d9SAl Viro void v9fs_evict_inode(struct inode *inode) 41760e78d2cSAbhishek Kulkarni { 4186b39f6d2SAneesh Kumar K.V struct v9fs_inode *v9inode = V9FS_I(inode); 4196b39f6d2SAneesh Kumar K.V 420b57922d9SAl Viro truncate_inode_pages(inode->i_mapping, 0); 421b57922d9SAl Viro end_writeback(inode); 42260e78d2cSAbhishek Kulkarni filemap_fdatawrite(inode->i_mapping); 42360e78d2cSAbhishek Kulkarni 42460e78d2cSAbhishek Kulkarni #ifdef CONFIG_9P_FSCACHE 42560e78d2cSAbhishek Kulkarni v9fs_cache_inode_put_cookie(inode); 42660e78d2cSAbhishek Kulkarni #endif 4276b39f6d2SAneesh Kumar K.V /* clunk the fid stashed in writeback_fid */ 4286b39f6d2SAneesh Kumar K.V if (v9inode->writeback_fid) { 4296b39f6d2SAneesh Kumar K.V p9_client_clunk(v9inode->writeback_fid); 4306b39f6d2SAneesh Kumar K.V v9inode->writeback_fid = NULL; 4313cf387d7SAneesh Kumar K.V } 43260e78d2cSAbhishek Kulkarni } 43360e78d2cSAbhishek Kulkarni 4345ffc0cb3SAneesh Kumar K.V static struct inode *v9fs_qid_iget(struct super_block *sb, 4355ffc0cb3SAneesh Kumar K.V struct p9_qid *qid, 4365ffc0cb3SAneesh Kumar K.V struct p9_wstat *st) 4375ffc0cb3SAneesh Kumar K.V { 4385ffc0cb3SAneesh Kumar K.V int retval, umode; 4395ffc0cb3SAneesh Kumar K.V unsigned long i_ino; 4405ffc0cb3SAneesh Kumar K.V struct inode *inode; 4415ffc0cb3SAneesh Kumar K.V struct v9fs_session_info *v9ses = sb->s_fs_info; 4425ffc0cb3SAneesh Kumar K.V 4435ffc0cb3SAneesh Kumar K.V i_ino = v9fs_qid2ino(qid); 4445ffc0cb3SAneesh Kumar K.V inode = iget_locked(sb, i_ino); 4455ffc0cb3SAneesh Kumar K.V if (!inode) 4465ffc0cb3SAneesh Kumar K.V return ERR_PTR(-ENOMEM); 4475ffc0cb3SAneesh Kumar K.V if (!(inode->i_state & I_NEW)) 4485ffc0cb3SAneesh Kumar K.V return inode; 4495ffc0cb3SAneesh Kumar K.V /* 4505ffc0cb3SAneesh Kumar K.V * initialize the inode with the stat info 4515ffc0cb3SAneesh Kumar K.V * FIXME!! we may need support for stale inodes 4525ffc0cb3SAneesh Kumar K.V * later. 4535ffc0cb3SAneesh Kumar K.V */ 4545ffc0cb3SAneesh Kumar K.V umode = p9mode2unixmode(v9ses, st->mode); 4555ffc0cb3SAneesh Kumar K.V retval = v9fs_init_inode(v9ses, inode, umode); 4565ffc0cb3SAneesh Kumar K.V if (retval) 4575ffc0cb3SAneesh Kumar K.V goto error; 4585ffc0cb3SAneesh Kumar K.V 4595ffc0cb3SAneesh Kumar K.V v9fs_stat2inode(st, inode, sb); 4605ffc0cb3SAneesh Kumar K.V #ifdef CONFIG_9P_FSCACHE 461a78ce05dSAneesh Kumar K.V v9fs_fscache_set_key(inode, &st->qid); 4625ffc0cb3SAneesh Kumar K.V v9fs_cache_inode_get_cookie(inode); 4635ffc0cb3SAneesh Kumar K.V #endif 4645ffc0cb3SAneesh Kumar K.V unlock_new_inode(inode); 4655ffc0cb3SAneesh Kumar K.V return inode; 4665ffc0cb3SAneesh Kumar K.V error: 4675ffc0cb3SAneesh Kumar K.V unlock_new_inode(inode); 4685ffc0cb3SAneesh Kumar K.V iput(inode); 4695ffc0cb3SAneesh Kumar K.V return ERR_PTR(retval); 4705ffc0cb3SAneesh Kumar K.V 4715ffc0cb3SAneesh Kumar K.V } 4725ffc0cb3SAneesh Kumar K.V 47353c06f4eSAneesh Kumar K.V struct inode * 474a78ce05dSAneesh Kumar K.V v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 4756a3124a3SLatchesar Ionkov struct super_block *sb) 4766a3124a3SLatchesar Ionkov { 47751a87c55SEric Van Hensbergen struct p9_wstat *st; 4785ffc0cb3SAneesh Kumar K.V struct inode *inode = NULL; 4796a3124a3SLatchesar Ionkov 480bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 48102bc3567SAbhishek Kulkarni if (IS_ERR(st)) 48202bc3567SAbhishek Kulkarni return ERR_CAST(st); 4832bad8471SEric Van Hensbergen 4845ffc0cb3SAneesh Kumar K.V inode = v9fs_qid_iget(sb, &st->qid, st); 48502bc3567SAbhishek Kulkarni p9stat_free(st); 486bd238fb4SLatchesar Ionkov kfree(st); 4875ffc0cb3SAneesh Kumar K.V return inode; 4882bad8471SEric Van Hensbergen } 4892bad8471SEric Van Hensbergen 4902bad8471SEric Van Hensbergen /** 4912bad8471SEric Van Hensbergen * v9fs_remove - helper function to remove files and directories 49273c592b9SEric Van Hensbergen * @dir: directory inode that is being deleted 49373c592b9SEric Van Hensbergen * @file: dentry that is being deleted 49473c592b9SEric Van Hensbergen * @rmdir: removing a directory 4952bad8471SEric Van Hensbergen * 4962bad8471SEric Van Hensbergen */ 4972bad8471SEric Van Hensbergen 4982bad8471SEric Van Hensbergen static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) 4992bad8471SEric Van Hensbergen { 500d994f405SAneesh Kumar K.V int retval; 501bd238fb4SLatchesar Ionkov struct inode *file_inode; 502bd238fb4SLatchesar Ionkov struct p9_fid *v9fid; 5032bad8471SEric Van Hensbergen 504bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, 5052bad8471SEric Van Hensbergen rmdir); 5062bad8471SEric Van Hensbergen 5072bad8471SEric Van Hensbergen file_inode = file->d_inode; 508c959df9fSLatchesar Ionkov v9fid = v9fs_fid_clone(file); 509da977b2cSEric Van Hensbergen if (IS_ERR(v9fid)) 510da977b2cSEric Van Hensbergen return PTR_ERR(v9fid); 5112bad8471SEric Van Hensbergen 512d994f405SAneesh Kumar K.V retval = p9_client_remove(v9fid); 513b271ec47SAneesh Kumar K.V if (!retval) { 514b271ec47SAneesh Kumar K.V /* 515b271ec47SAneesh Kumar K.V * directories on unlink should have zero 516b271ec47SAneesh Kumar K.V * link count 517b271ec47SAneesh Kumar K.V */ 518b271ec47SAneesh Kumar K.V if (rmdir) { 519b271ec47SAneesh Kumar K.V clear_nlink(file_inode); 520b271ec47SAneesh Kumar K.V drop_nlink(dir); 521b271ec47SAneesh Kumar K.V } else 522d994f405SAneesh Kumar K.V drop_nlink(file_inode); 523b271ec47SAneesh Kumar K.V } 524d994f405SAneesh Kumar K.V return retval; 5252bad8471SEric Van Hensbergen } 5262bad8471SEric Van Hensbergen 527bd238fb4SLatchesar Ionkov /** 528bd238fb4SLatchesar Ionkov * v9fs_create - Create a file 529ee443996SEric Van Hensbergen * @v9ses: session information 530ee443996SEric Van Hensbergen * @dir: directory that dentry is being created in 531bd238fb4SLatchesar Ionkov * @dentry: dentry that is being created 5320e15597eSAbhishek Kulkarni * @extension: 9p2000.u extension string to support devices, etc. 533bd238fb4SLatchesar Ionkov * @perm: create permissions 534bd238fb4SLatchesar Ionkov * @mode: open mode 535bd238fb4SLatchesar Ionkov * 536bd238fb4SLatchesar Ionkov */ 537bd238fb4SLatchesar Ionkov static struct p9_fid * 538bd238fb4SLatchesar Ionkov v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 539bd238fb4SLatchesar Ionkov struct dentry *dentry, char *extension, u32 perm, u8 mode) 540bd238fb4SLatchesar Ionkov { 541bd238fb4SLatchesar Ionkov int err; 542bd238fb4SLatchesar Ionkov char *name; 543bd238fb4SLatchesar Ionkov struct p9_fid *dfid, *ofid, *fid; 544bd238fb4SLatchesar Ionkov struct inode *inode; 545bd238fb4SLatchesar Ionkov 54651a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 54751a87c55SEric Van Hensbergen 548bd238fb4SLatchesar Ionkov err = 0; 549bd238fb4SLatchesar Ionkov ofid = NULL; 550bd238fb4SLatchesar Ionkov fid = NULL; 551bd238fb4SLatchesar Ionkov name = (char *) dentry->d_name.name; 5526d27e64dSVenkateswararao Jujjuri dfid = v9fs_fid_lookup(dentry->d_parent); 553bd238fb4SLatchesar Ionkov if (IS_ERR(dfid)) { 554bd238fb4SLatchesar Ionkov err = PTR_ERR(dfid); 5556d27e64dSVenkateswararao Jujjuri P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 5566d27e64dSVenkateswararao Jujjuri return ERR_PTR(err); 557bd238fb4SLatchesar Ionkov } 558bd238fb4SLatchesar Ionkov 559bd238fb4SLatchesar Ionkov /* clone a fid to use for creation */ 560bd238fb4SLatchesar Ionkov ofid = p9_client_walk(dfid, 0, NULL, 1); 561bd238fb4SLatchesar Ionkov if (IS_ERR(ofid)) { 562bd238fb4SLatchesar Ionkov err = PTR_ERR(ofid); 56351a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 5646d27e64dSVenkateswararao Jujjuri return ERR_PTR(err); 565bd238fb4SLatchesar Ionkov } 566bd238fb4SLatchesar Ionkov 567bd238fb4SLatchesar Ionkov err = p9_client_fcreate(ofid, name, perm, mode, extension); 56851a87c55SEric Van Hensbergen if (err < 0) { 56951a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 570bd238fb4SLatchesar Ionkov goto error; 57151a87c55SEric Van Hensbergen } 572bd238fb4SLatchesar Ionkov 573bd238fb4SLatchesar Ionkov /* now walk from the parent so we can get unopened fid */ 5746d27e64dSVenkateswararao Jujjuri fid = p9_client_walk(dfid, 1, &name, 1); 575bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 576bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 57751a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 578bd238fb4SLatchesar Ionkov fid = NULL; 579bd238fb4SLatchesar Ionkov goto error; 5806d27e64dSVenkateswararao Jujjuri } 581bd238fb4SLatchesar Ionkov 582bd238fb4SLatchesar Ionkov /* instantiate inode and assign the unopened fid to the dentry */ 583a78ce05dSAneesh Kumar K.V inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); 584bd238fb4SLatchesar Ionkov if (IS_ERR(inode)) { 585bd238fb4SLatchesar Ionkov err = PTR_ERR(inode); 58651a87c55SEric Van Hensbergen P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); 587bd238fb4SLatchesar Ionkov goto error; 588bd238fb4SLatchesar Ionkov } 589bd238fb4SLatchesar Ionkov d_instantiate(dentry, inode); 59050fb6d2bSAbhishek Kulkarni err = v9fs_fid_add(dentry, fid); 59150fb6d2bSAbhishek Kulkarni if (err < 0) 59250fb6d2bSAbhishek Kulkarni goto error; 59350fb6d2bSAbhishek Kulkarni 594bd238fb4SLatchesar Ionkov return ofid; 595bd238fb4SLatchesar Ionkov 596bd238fb4SLatchesar Ionkov error: 597bd238fb4SLatchesar Ionkov if (ofid) 598bd238fb4SLatchesar Ionkov p9_client_clunk(ofid); 599bd238fb4SLatchesar Ionkov 600bd238fb4SLatchesar Ionkov if (fid) 601bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 602bd238fb4SLatchesar Ionkov 603bd238fb4SLatchesar Ionkov return ERR_PTR(err); 604bd238fb4SLatchesar Ionkov } 605bd238fb4SLatchesar Ionkov 6062bad8471SEric Van Hensbergen /** 6072bad8471SEric Van Hensbergen * v9fs_vfs_create - VFS hook to create files 608ee443996SEric Van Hensbergen * @dir: directory inode that is being created 6092bad8471SEric Van Hensbergen * @dentry: dentry that is being deleted 6106a3124a3SLatchesar Ionkov * @mode: create permissions 6112bad8471SEric Van Hensbergen * @nd: path information 6122bad8471SEric Van Hensbergen * 6132bad8471SEric Van Hensbergen */ 6142bad8471SEric Van Hensbergen 6152bad8471SEric Van Hensbergen static int 6166a3124a3SLatchesar Ionkov v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, 6172bad8471SEric Van Hensbergen struct nameidata *nd) 6182bad8471SEric Van Hensbergen { 6196a3124a3SLatchesar Ionkov int err; 620bd238fb4SLatchesar Ionkov u32 perm; 6216a3124a3SLatchesar Ionkov int flags; 6226b39f6d2SAneesh Kumar K.V struct file *filp; 6236b39f6d2SAneesh Kumar K.V struct v9fs_inode *v9inode; 6246a3124a3SLatchesar Ionkov struct v9fs_session_info *v9ses; 6253cf387d7SAneesh Kumar K.V struct p9_fid *fid, *inode_fid; 6266a3124a3SLatchesar Ionkov 627bd238fb4SLatchesar Ionkov err = 0; 628bd238fb4SLatchesar Ionkov fid = NULL; 6296a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 630da977b2cSEric Van Hensbergen perm = unixmode2p9mode(v9ses, mode); 6316a3124a3SLatchesar Ionkov if (nd && nd->flags & LOOKUP_OPEN) 6326a3124a3SLatchesar Ionkov flags = nd->intent.open.flags - 1; 6336a3124a3SLatchesar Ionkov else 6346a3124a3SLatchesar Ionkov flags = O_RDWR; 6356a3124a3SLatchesar Ionkov 636bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 637dd6102fbSSripathi Kodi v9fs_uflags2omode(flags, 638dd6102fbSSripathi Kodi v9fs_proto_dotu(v9ses))); 639bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 640bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 641bd238fb4SLatchesar Ionkov fid = NULL; 6426a3124a3SLatchesar Ionkov goto error; 6436a3124a3SLatchesar Ionkov } 6446a3124a3SLatchesar Ionkov 645bd238fb4SLatchesar Ionkov /* if we are opening a file, assign the open fid to the file */ 6466a3124a3SLatchesar Ionkov if (nd && nd->flags & LOOKUP_OPEN) { 6476b39f6d2SAneesh Kumar K.V v9inode = V9FS_I(dentry->d_inode); 6486b39f6d2SAneesh Kumar K.V if (v9ses->cache && !v9inode->writeback_fid) { 6493cf387d7SAneesh Kumar K.V /* 6506b39f6d2SAneesh Kumar K.V * clone a fid and add it to writeback_fid 6513cf387d7SAneesh Kumar K.V * we do it during open time instead of 6523cf387d7SAneesh Kumar K.V * page dirty time via write_begin/page_mkwrite 6533cf387d7SAneesh Kumar K.V * because we want write after unlink usecase 6543cf387d7SAneesh Kumar K.V * to work. 6553cf387d7SAneesh Kumar K.V */ 6563cf387d7SAneesh Kumar K.V inode_fid = v9fs_writeback_fid(dentry); 6573cf387d7SAneesh Kumar K.V if (IS_ERR(inode_fid)) { 6583cf387d7SAneesh Kumar K.V err = PTR_ERR(inode_fid); 6593cf387d7SAneesh Kumar K.V goto error; 6603cf387d7SAneesh Kumar K.V } 6616b39f6d2SAneesh Kumar K.V v9inode->writeback_fid = (void *) inode_fid; 6623cf387d7SAneesh Kumar K.V } 663877cb3d4SAneesh Kumar K.V filp = lookup_instantiate_filp(nd, dentry, generic_file_open); 6646a3124a3SLatchesar Ionkov if (IS_ERR(filp)) { 665bd238fb4SLatchesar Ionkov err = PTR_ERR(filp); 666bd238fb4SLatchesar Ionkov goto error; 6676a3124a3SLatchesar Ionkov } 6686a3124a3SLatchesar Ionkov 669bd238fb4SLatchesar Ionkov filp->private_data = fid; 67046848de0SAneesh Kumar K.V #ifdef CONFIG_9P_FSCACHE 67146848de0SAneesh Kumar K.V if (v9ses->cache) 67246848de0SAneesh Kumar K.V v9fs_cache_inode_set_cookie(dentry->d_inode, filp); 67346848de0SAneesh Kumar K.V #endif 674bd238fb4SLatchesar Ionkov } else 675bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 6766a3124a3SLatchesar Ionkov 6776a3124a3SLatchesar Ionkov return 0; 6786a3124a3SLatchesar Ionkov 6796a3124a3SLatchesar Ionkov error: 680bd238fb4SLatchesar Ionkov if (fid) 681bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 6826a3124a3SLatchesar Ionkov 6836a3124a3SLatchesar Ionkov return err; 6842bad8471SEric Van Hensbergen } 6852bad8471SEric Van Hensbergen 6862bad8471SEric Van Hensbergen /** 6872bad8471SEric Van Hensbergen * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 688ee443996SEric Van Hensbergen * @dir: inode that is being unlinked 6892bad8471SEric Van Hensbergen * @dentry: dentry that is being unlinked 6902bad8471SEric Van Hensbergen * @mode: mode for new directory 6912bad8471SEric Van Hensbergen * 6922bad8471SEric Van Hensbergen */ 6932bad8471SEric Van Hensbergen 6946a3124a3SLatchesar Ionkov static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 6952bad8471SEric Van Hensbergen { 6966a3124a3SLatchesar Ionkov int err; 697bd238fb4SLatchesar Ionkov u32 perm; 6986a3124a3SLatchesar Ionkov struct v9fs_session_info *v9ses; 699bd238fb4SLatchesar Ionkov struct p9_fid *fid; 7006a3124a3SLatchesar Ionkov 701bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 702bd238fb4SLatchesar Ionkov err = 0; 7036a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 7046a3124a3SLatchesar Ionkov perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 705bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 706bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 707bd238fb4SLatchesar Ionkov err = PTR_ERR(fid); 708bd238fb4SLatchesar Ionkov fid = NULL; 709b271ec47SAneesh Kumar K.V } else 710b271ec47SAneesh Kumar K.V inc_nlink(dir); 7116a3124a3SLatchesar Ionkov 712bd238fb4SLatchesar Ionkov if (fid) 713bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 7146a3124a3SLatchesar Ionkov 7156a3124a3SLatchesar Ionkov return err; 7162bad8471SEric Van Hensbergen } 7172bad8471SEric Van Hensbergen 7182bad8471SEric Van Hensbergen /** 7192bad8471SEric Van Hensbergen * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 7202bad8471SEric Van Hensbergen * @dir: inode that is being walked from 7212bad8471SEric Van Hensbergen * @dentry: dentry that is being walked to? 7222bad8471SEric Van Hensbergen * @nameidata: path data 7232bad8471SEric Van Hensbergen * 7242bad8471SEric Van Hensbergen */ 7252bad8471SEric Van Hensbergen 72653c06f4eSAneesh Kumar K.V struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 7272bad8471SEric Van Hensbergen struct nameidata *nameidata) 7282bad8471SEric Van Hensbergen { 7292bad8471SEric Van Hensbergen struct super_block *sb; 7302bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses; 731bd238fb4SLatchesar Ionkov struct p9_fid *dfid, *fid; 7322bad8471SEric Van Hensbergen struct inode *inode; 733bd238fb4SLatchesar Ionkov char *name; 7342bad8471SEric Van Hensbergen int result = 0; 7352bad8471SEric Van Hensbergen 736bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", 737731805b4SLatchesar Ionkov dir, dentry->d_name.name, dentry, nameidata); 7382bad8471SEric Van Hensbergen 73911e9b49bSSripathi Kodi if (dentry->d_name.len > NAME_MAX) 74011e9b49bSSripathi Kodi return ERR_PTR(-ENAMETOOLONG); 74111e9b49bSSripathi Kodi 7422bad8471SEric Van Hensbergen sb = dir->i_sb; 7432bad8471SEric Van Hensbergen v9ses = v9fs_inode2v9ses(dir); 744a534c8d1SAneesh Kumar K.V /* We can walk d_parent because we hold the dir->i_mutex */ 745bd238fb4SLatchesar Ionkov dfid = v9fs_fid_lookup(dentry->d_parent); 746bd238fb4SLatchesar Ionkov if (IS_ERR(dfid)) 747e231c2eeSDavid Howells return ERR_CAST(dfid); 7482bad8471SEric Van Hensbergen 749bd238fb4SLatchesar Ionkov name = (char *) dentry->d_name.name; 750bd238fb4SLatchesar Ionkov fid = p9_client_walk(dfid, 1, &name, 1); 751bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) { 752bd238fb4SLatchesar Ionkov result = PTR_ERR(fid); 7532bad8471SEric Van Hensbergen if (result == -ENOENT) { 75485e0df24SAneesh Kumar K.V inode = NULL; 75585e0df24SAneesh Kumar K.V goto inst_out; 7562bad8471SEric Van Hensbergen } 7572bad8471SEric Van Hensbergen 758bd238fb4SLatchesar Ionkov return ERR_PTR(result); 7592bad8471SEric Van Hensbergen } 7602bad8471SEric Van Hensbergen 761a78ce05dSAneesh Kumar K.V inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); 762bd238fb4SLatchesar Ionkov if (IS_ERR(inode)) { 763bd238fb4SLatchesar Ionkov result = PTR_ERR(inode); 764bd238fb4SLatchesar Ionkov inode = NULL; 765bd238fb4SLatchesar Ionkov goto error; 7662bad8471SEric Van Hensbergen } 7672bad8471SEric Van Hensbergen 768bd238fb4SLatchesar Ionkov result = v9fs_fid_add(dentry, fid); 7696a3124a3SLatchesar Ionkov if (result < 0) 7709856af8bSAneesh Kumar K.V goto error_iput; 7716a3124a3SLatchesar Ionkov 77285e0df24SAneesh Kumar K.V inst_out: 7732bad8471SEric Van Hensbergen d_add(dentry, inode); 7742bad8471SEric Van Hensbergen return NULL; 7752bad8471SEric Van Hensbergen 7769856af8bSAneesh Kumar K.V error_iput: 7779856af8bSAneesh Kumar K.V iput(inode); 778bd238fb4SLatchesar Ionkov error: 779bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 780da977b2cSEric Van Hensbergen 7812bad8471SEric Van Hensbergen return ERR_PTR(result); 7822bad8471SEric Van Hensbergen } 7832bad8471SEric Van Hensbergen 7842bad8471SEric Van Hensbergen /** 7852bad8471SEric Van Hensbergen * v9fs_vfs_unlink - VFS unlink hook to delete an inode 7862bad8471SEric Van Hensbergen * @i: inode that is being unlinked 78773c592b9SEric Van Hensbergen * @d: dentry that is being unlinked 7882bad8471SEric Van Hensbergen * 7892bad8471SEric Van Hensbergen */ 7902bad8471SEric Van Hensbergen 79153c06f4eSAneesh Kumar K.V int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 7922bad8471SEric Van Hensbergen { 7932bad8471SEric Van Hensbergen return v9fs_remove(i, d, 0); 7942bad8471SEric Van Hensbergen } 7952bad8471SEric Van Hensbergen 7962bad8471SEric Van Hensbergen /** 7972bad8471SEric Van Hensbergen * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 7982bad8471SEric Van Hensbergen * @i: inode that is being unlinked 79973c592b9SEric Van Hensbergen * @d: dentry that is being unlinked 8002bad8471SEric Van Hensbergen * 8012bad8471SEric Van Hensbergen */ 8022bad8471SEric Van Hensbergen 80353c06f4eSAneesh Kumar K.V int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 8042bad8471SEric Van Hensbergen { 8052bad8471SEric Van Hensbergen return v9fs_remove(i, d, 1); 8062bad8471SEric Van Hensbergen } 8072bad8471SEric Van Hensbergen 8082bad8471SEric Van Hensbergen /** 8092bad8471SEric Van Hensbergen * v9fs_vfs_rename - VFS hook to rename an inode 8102bad8471SEric Van Hensbergen * @old_dir: old dir inode 8112bad8471SEric Van Hensbergen * @old_dentry: old dentry 8122bad8471SEric Van Hensbergen * @new_dir: new dir inode 8132bad8471SEric Van Hensbergen * @new_dentry: new dentry 8142bad8471SEric Van Hensbergen * 8152bad8471SEric Van Hensbergen */ 8162bad8471SEric Van Hensbergen 81753c06f4eSAneesh Kumar K.V int 8182bad8471SEric Van Hensbergen v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 8192bad8471SEric Van Hensbergen struct inode *new_dir, struct dentry *new_dentry) 8202bad8471SEric Van Hensbergen { 821bd238fb4SLatchesar Ionkov struct inode *old_inode; 822b271ec47SAneesh Kumar K.V struct inode *new_inode; 823bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 824bd238fb4SLatchesar Ionkov struct p9_fid *oldfid; 825bd238fb4SLatchesar Ionkov struct p9_fid *olddirfid; 826bd238fb4SLatchesar Ionkov struct p9_fid *newdirfid; 827bd238fb4SLatchesar Ionkov struct p9_wstat wstat; 828bd238fb4SLatchesar Ionkov int retval; 8292bad8471SEric Van Hensbergen 830bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "\n"); 831bd238fb4SLatchesar Ionkov retval = 0; 832bd238fb4SLatchesar Ionkov old_inode = old_dentry->d_inode; 833b271ec47SAneesh Kumar K.V new_inode = new_dentry->d_inode; 834bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(old_inode); 835bd238fb4SLatchesar Ionkov oldfid = v9fs_fid_lookup(old_dentry); 836da977b2cSEric Van Hensbergen if (IS_ERR(oldfid)) 837da977b2cSEric Van Hensbergen return PTR_ERR(oldfid); 838da977b2cSEric Van Hensbergen 839da977b2cSEric Van Hensbergen olddirfid = v9fs_fid_clone(old_dentry->d_parent); 840da977b2cSEric Van Hensbergen if (IS_ERR(olddirfid)) { 841da977b2cSEric Van Hensbergen retval = PTR_ERR(olddirfid); 842bd238fb4SLatchesar Ionkov goto done; 843da977b2cSEric Van Hensbergen } 844da977b2cSEric Van Hensbergen 845da977b2cSEric Van Hensbergen newdirfid = v9fs_fid_clone(new_dentry->d_parent); 846da977b2cSEric Van Hensbergen if (IS_ERR(newdirfid)) { 847da977b2cSEric Van Hensbergen retval = PTR_ERR(newdirfid); 848bd238fb4SLatchesar Ionkov goto clunk_olddir; 8492bad8471SEric Van Hensbergen } 8502bad8471SEric Van Hensbergen 851a534c8d1SAneesh Kumar K.V down_write(&v9ses->rename_sem); 8524681dbdaSSripathi Kodi if (v9fs_proto_dotl(v9ses)) { 8534681dbdaSSripathi Kodi retval = p9_client_rename(oldfid, newdirfid, 8544681dbdaSSripathi Kodi (char *) new_dentry->d_name.name); 8554681dbdaSSripathi Kodi if (retval != -ENOSYS) 8564681dbdaSSripathi Kodi goto clunk_newdir; 8574681dbdaSSripathi Kodi } 858a534c8d1SAneesh Kumar K.V if (old_dentry->d_parent != new_dentry->d_parent) { 859a534c8d1SAneesh Kumar K.V /* 860a534c8d1SAneesh Kumar K.V * 9P .u can only handle file rename in the same directory 861a534c8d1SAneesh Kumar K.V */ 8624681dbdaSSripathi Kodi 863bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, 864bd238fb4SLatchesar Ionkov "old dir and new dir are different\n"); 865621997cdSEric Van Hensbergen retval = -EXDEV; 866bd238fb4SLatchesar Ionkov goto clunk_newdir; 8672bad8471SEric Van Hensbergen } 868531b1094SLatchesar Ionkov v9fs_blank_wstat(&wstat); 869ba17674fSLatchesar Ionkov wstat.muid = v9ses->uname; 870531b1094SLatchesar Ionkov wstat.name = (char *) new_dentry->d_name.name; 871bd238fb4SLatchesar Ionkov retval = p9_client_wstat(oldfid, &wstat); 8722bad8471SEric Van Hensbergen 873bd238fb4SLatchesar Ionkov clunk_newdir: 874b271ec47SAneesh Kumar K.V if (!retval) { 875b271ec47SAneesh Kumar K.V if (new_inode) { 876b271ec47SAneesh Kumar K.V if (S_ISDIR(new_inode->i_mode)) 877b271ec47SAneesh Kumar K.V clear_nlink(new_inode); 878b271ec47SAneesh Kumar K.V else 879b271ec47SAneesh Kumar K.V drop_nlink(new_inode); 880b271ec47SAneesh Kumar K.V } 881b271ec47SAneesh Kumar K.V if (S_ISDIR(old_inode->i_mode)) { 882b271ec47SAneesh Kumar K.V if (!new_inode) 883b271ec47SAneesh Kumar K.V inc_nlink(new_dir); 884b271ec47SAneesh Kumar K.V drop_nlink(old_dir); 885b271ec47SAneesh Kumar K.V } 886a534c8d1SAneesh Kumar K.V /* successful rename */ 887a534c8d1SAneesh Kumar K.V d_move(old_dentry, new_dentry); 888b271ec47SAneesh Kumar K.V } 889a534c8d1SAneesh Kumar K.V up_write(&v9ses->rename_sem); 89022150c4fSLatchesar Ionkov p9_client_clunk(newdirfid); 8912bad8471SEric Van Hensbergen 892bd238fb4SLatchesar Ionkov clunk_olddir: 89322150c4fSLatchesar Ionkov p9_client_clunk(olddirfid); 8942bad8471SEric Van Hensbergen 895bd238fb4SLatchesar Ionkov done: 8962bad8471SEric Van Hensbergen return retval; 8972bad8471SEric Van Hensbergen } 8982bad8471SEric Van Hensbergen 8992bad8471SEric Van Hensbergen /** 900943ffb58SAdrian Bunk * v9fs_vfs_getattr - retrieve file metadata 901ee443996SEric Van Hensbergen * @mnt: mount information 902ee443996SEric Van Hensbergen * @dentry: file to get attributes on 903ee443996SEric Van Hensbergen * @stat: metadata structure to populate 9042bad8471SEric Van Hensbergen * 9052bad8471SEric Van Hensbergen */ 9062bad8471SEric Van Hensbergen 9072bad8471SEric Van Hensbergen static int 9082bad8471SEric Van Hensbergen v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 9092bad8471SEric Van Hensbergen struct kstat *stat) 9102bad8471SEric Van Hensbergen { 911bd238fb4SLatchesar Ionkov int err; 912bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 913bd238fb4SLatchesar Ionkov struct p9_fid *fid; 91451a87c55SEric Van Hensbergen struct p9_wstat *st; 9152bad8471SEric Van Hensbergen 916bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); 917bd238fb4SLatchesar Ionkov err = -EPERM; 918bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dentry->d_inode); 919a1211908SAneesh Kumar K.V if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 920a1211908SAneesh Kumar K.V generic_fillattr(dentry->d_inode, stat); 921a1211908SAneesh Kumar K.V return 0; 922a1211908SAneesh Kumar K.V } 923bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 924da977b2cSEric Van Hensbergen if (IS_ERR(fid)) 925da977b2cSEric Van Hensbergen return PTR_ERR(fid); 9262bad8471SEric Van Hensbergen 927bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 928bd238fb4SLatchesar Ionkov if (IS_ERR(st)) 929bd238fb4SLatchesar Ionkov return PTR_ERR(st); 9302bad8471SEric Van Hensbergen 931bd238fb4SLatchesar Ionkov v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); 9322bad8471SEric Van Hensbergen generic_fillattr(dentry->d_inode, stat); 9332bad8471SEric Van Hensbergen 93462b2be59SLatchesar Ionkov p9stat_free(st); 935bd238fb4SLatchesar Ionkov kfree(st); 936bd238fb4SLatchesar Ionkov return 0; 9372bad8471SEric Van Hensbergen } 9382bad8471SEric Van Hensbergen 9392bad8471SEric Van Hensbergen /** 9402bad8471SEric Van Hensbergen * v9fs_vfs_setattr - set file metadata 9412bad8471SEric Van Hensbergen * @dentry: file whose metadata to set 9422bad8471SEric Van Hensbergen * @iattr: metadata assignment structure 9432bad8471SEric Van Hensbergen * 9442bad8471SEric Van Hensbergen */ 9452bad8471SEric Van Hensbergen 9462bad8471SEric Van Hensbergen static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 9472bad8471SEric Van Hensbergen { 948bd238fb4SLatchesar Ionkov int retval; 949bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 950bd238fb4SLatchesar Ionkov struct p9_fid *fid; 951bd238fb4SLatchesar Ionkov struct p9_wstat wstat; 9522bad8471SEric Van Hensbergen 953bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "\n"); 954bd238fb4SLatchesar Ionkov retval = -EPERM; 955bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dentry->d_inode); 956bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 957da977b2cSEric Van Hensbergen if(IS_ERR(fid)) 958da977b2cSEric Van Hensbergen return PTR_ERR(fid); 9592bad8471SEric Van Hensbergen 960531b1094SLatchesar Ionkov v9fs_blank_wstat(&wstat); 9612bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_MODE) 962531b1094SLatchesar Ionkov wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 9632bad8471SEric Van Hensbergen 9642bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_MTIME) 965531b1094SLatchesar Ionkov wstat.mtime = iattr->ia_mtime.tv_sec; 9662bad8471SEric Van Hensbergen 9672bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_ATIME) 968531b1094SLatchesar Ionkov wstat.atime = iattr->ia_atime.tv_sec; 9692bad8471SEric Van Hensbergen 9702bad8471SEric Van Hensbergen if (iattr->ia_valid & ATTR_SIZE) 971531b1094SLatchesar Ionkov wstat.length = iattr->ia_size; 9722bad8471SEric Van Hensbergen 973dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 974531b1094SLatchesar Ionkov if (iattr->ia_valid & ATTR_UID) 975531b1094SLatchesar Ionkov wstat.n_uid = iattr->ia_uid; 9762bad8471SEric Van Hensbergen 977531b1094SLatchesar Ionkov if (iattr->ia_valid & ATTR_GID) 978531b1094SLatchesar Ionkov wstat.n_gid = iattr->ia_gid; 9792bad8471SEric Van Hensbergen } 9802bad8471SEric Van Hensbergen 981bd238fb4SLatchesar Ionkov retval = p9_client_wstat(fid, &wstat); 9821025774cSChristoph Hellwig if (retval < 0) 983bd238fb4SLatchesar Ionkov return retval; 9841025774cSChristoph Hellwig 9851025774cSChristoph Hellwig if ((iattr->ia_valid & ATTR_SIZE) && 9861025774cSChristoph Hellwig iattr->ia_size != i_size_read(dentry->d_inode)) { 9871025774cSChristoph Hellwig retval = vmtruncate(dentry->d_inode, iattr->ia_size); 9881025774cSChristoph Hellwig if (retval) 9891025774cSChristoph Hellwig return retval; 9901025774cSChristoph Hellwig } 9911025774cSChristoph Hellwig 9921025774cSChristoph Hellwig setattr_copy(dentry->d_inode, iattr); 9931025774cSChristoph Hellwig mark_inode_dirty(dentry->d_inode); 9941025774cSChristoph Hellwig return 0; 9952bad8471SEric Van Hensbergen } 9962bad8471SEric Van Hensbergen 9972bad8471SEric Van Hensbergen /** 998531b1094SLatchesar Ionkov * v9fs_stat2inode - populate an inode structure with mistat info 999531b1094SLatchesar Ionkov * @stat: Plan 9 metadata (mistat) structure 10002bad8471SEric Van Hensbergen * @inode: inode to populate 10012bad8471SEric Van Hensbergen * @sb: superblock of filesystem 10022bad8471SEric Van Hensbergen * 10032bad8471SEric Van Hensbergen */ 10042bad8471SEric Van Hensbergen 10052bad8471SEric Van Hensbergen void 100651a87c55SEric Van Hensbergen v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 10072bad8471SEric Van Hensbergen struct super_block *sb) 10082bad8471SEric Van Hensbergen { 1009531b1094SLatchesar Ionkov char ext[32]; 10105717144aSAneesh Kumar K.V char tag_name[14]; 10115717144aSAneesh Kumar K.V unsigned int i_nlink; 10122bad8471SEric Van Hensbergen struct v9fs_session_info *v9ses = sb->s_fs_info; 10132bad8471SEric Van Hensbergen 10142bad8471SEric Van Hensbergen inode->i_nlink = 1; 10152bad8471SEric Van Hensbergen 1016531b1094SLatchesar Ionkov inode->i_atime.tv_sec = stat->atime; 1017531b1094SLatchesar Ionkov inode->i_mtime.tv_sec = stat->mtime; 1018531b1094SLatchesar Ionkov inode->i_ctime.tv_sec = stat->mtime; 10192bad8471SEric Van Hensbergen 1020bd32b82dSLatchesar Ionkov inode->i_uid = v9ses->dfltuid; 1021bd32b82dSLatchesar Ionkov inode->i_gid = v9ses->dfltgid; 10222bad8471SEric Van Hensbergen 1023dd6102fbSSripathi Kodi if (v9fs_proto_dotu(v9ses)) { 1024531b1094SLatchesar Ionkov inode->i_uid = stat->n_uid; 1025531b1094SLatchesar Ionkov inode->i_gid = stat->n_gid; 1026531b1094SLatchesar Ionkov } 10275717144aSAneesh Kumar K.V if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 10285717144aSAneesh Kumar K.V if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { 10295717144aSAneesh Kumar K.V /* 10305717144aSAneesh Kumar K.V * Hadlink support got added later to 10315717144aSAneesh Kumar K.V * to the .u extension. So there can be 10325717144aSAneesh Kumar K.V * server out there that doesn't support 10335717144aSAneesh Kumar K.V * this even with .u extension. So check 10345717144aSAneesh Kumar K.V * for non NULL stat->extension 10355717144aSAneesh Kumar K.V */ 10365717144aSAneesh Kumar K.V strncpy(ext, stat->extension, sizeof(ext)); 10375717144aSAneesh Kumar K.V /* HARDLINKCOUNT %u */ 10385717144aSAneesh Kumar K.V sscanf(ext, "%13s %u", tag_name, &i_nlink); 10395717144aSAneesh Kumar K.V if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) 10405717144aSAneesh Kumar K.V inode->i_nlink = i_nlink; 10415717144aSAneesh Kumar K.V } 10425717144aSAneesh Kumar K.V } 1043531b1094SLatchesar Ionkov inode->i_mode = p9mode2unixmode(v9ses, stat->mode); 10442bad8471SEric Van Hensbergen if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { 10452bad8471SEric Van Hensbergen char type = 0; 10462bad8471SEric Van Hensbergen int major = -1; 10472bad8471SEric Van Hensbergen int minor = -1; 1048531b1094SLatchesar Ionkov 104951a87c55SEric Van Hensbergen strncpy(ext, stat->extension, sizeof(ext)); 1050531b1094SLatchesar Ionkov sscanf(ext, "%c %u %u", &type, &major, &minor); 10512bad8471SEric Van Hensbergen switch (type) { 10522bad8471SEric Van Hensbergen case 'c': 10532bad8471SEric Van Hensbergen inode->i_mode &= ~S_IFBLK; 10542bad8471SEric Van Hensbergen inode->i_mode |= S_IFCHR; 10552bad8471SEric Van Hensbergen break; 10562bad8471SEric Van Hensbergen case 'b': 10572bad8471SEric Van Hensbergen break; 10582bad8471SEric Van Hensbergen default: 1059bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, 106051a87c55SEric Van Hensbergen "Unknown special type %c %s\n", type, 106151a87c55SEric Van Hensbergen stat->extension); 10622bad8471SEric Van Hensbergen }; 10632bad8471SEric Van Hensbergen inode->i_rdev = MKDEV(major, minor); 106457c7b4e6SMagnus Deininger init_special_inode(inode, inode->i_mode, inode->i_rdev); 10652bad8471SEric Van Hensbergen } else 10662bad8471SEric Van Hensbergen inode->i_rdev = 0; 10672bad8471SEric Van Hensbergen 10687549ae3eSAbhishek Kulkarni i_size_write(inode, stat->length); 10692bad8471SEric Van Hensbergen 1070bd238fb4SLatchesar Ionkov /* not real number of blocks, but 512 byte ones ... */ 10717549ae3eSAbhishek Kulkarni inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; 10722bad8471SEric Van Hensbergen } 10732bad8471SEric Van Hensbergen 10742bad8471SEric Van Hensbergen /** 10752bad8471SEric Van Hensbergen * v9fs_qid2ino - convert qid into inode number 10762bad8471SEric Van Hensbergen * @qid: qid to hash 10772bad8471SEric Van Hensbergen * 10782bad8471SEric Van Hensbergen * BUG: potential for inode number collisions? 10792bad8471SEric Van Hensbergen */ 10802bad8471SEric Van Hensbergen 1081bd238fb4SLatchesar Ionkov ino_t v9fs_qid2ino(struct p9_qid *qid) 10822bad8471SEric Van Hensbergen { 10832bad8471SEric Van Hensbergen u64 path = qid->path + 2; 10842bad8471SEric Van Hensbergen ino_t i = 0; 10852bad8471SEric Van Hensbergen 10862bad8471SEric Van Hensbergen if (sizeof(ino_t) == sizeof(path)) 10872bad8471SEric Van Hensbergen memcpy(&i, &path, sizeof(ino_t)); 10882bad8471SEric Van Hensbergen else 10892bad8471SEric Van Hensbergen i = (ino_t) (path ^ (path >> 32)); 10902bad8471SEric Van Hensbergen 10912bad8471SEric Van Hensbergen return i; 10922bad8471SEric Van Hensbergen } 10932bad8471SEric Van Hensbergen 10942bad8471SEric Van Hensbergen /** 10952bad8471SEric Van Hensbergen * v9fs_readlink - read a symlink's location (internal version) 10962bad8471SEric Van Hensbergen * @dentry: dentry for symlink 109773c592b9SEric Van Hensbergen * @buffer: buffer to load symlink location into 10982bad8471SEric Van Hensbergen * @buflen: length of buffer 10992bad8471SEric Van Hensbergen * 11002bad8471SEric Van Hensbergen */ 11012bad8471SEric Van Hensbergen 11022bad8471SEric Van Hensbergen static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) 11032bad8471SEric Van Hensbergen { 1104bd238fb4SLatchesar Ionkov int retval; 11052bad8471SEric Van Hensbergen 1106bd238fb4SLatchesar Ionkov struct v9fs_session_info *v9ses; 1107bd238fb4SLatchesar Ionkov struct p9_fid *fid; 110851a87c55SEric Van Hensbergen struct p9_wstat *st; 11092bad8471SEric Van Hensbergen 1110bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); 1111bd238fb4SLatchesar Ionkov retval = -EPERM; 1112bd238fb4SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dentry->d_inode); 1113bd238fb4SLatchesar Ionkov fid = v9fs_fid_lookup(dentry); 1114da977b2cSEric Van Hensbergen if (IS_ERR(fid)) 1115da977b2cSEric Van Hensbergen return PTR_ERR(fid); 11162bad8471SEric Van Hensbergen 1117329176ccSM. Mohan Kumar if (!v9fs_proto_dotu(v9ses)) 1118bd238fb4SLatchesar Ionkov return -EBADF; 11192bad8471SEric Van Hensbergen 1120bd238fb4SLatchesar Ionkov st = p9_client_stat(fid); 1121bd238fb4SLatchesar Ionkov if (IS_ERR(st)) 1122bd238fb4SLatchesar Ionkov return PTR_ERR(st); 11232bad8471SEric Van Hensbergen 1124bd238fb4SLatchesar Ionkov if (!(st->mode & P9_DMSYMLINK)) { 11252bad8471SEric Van Hensbergen retval = -EINVAL; 1126bd238fb4SLatchesar Ionkov goto done; 11272bad8471SEric Van Hensbergen } 11282bad8471SEric Van Hensbergen 11292bad8471SEric Van Hensbergen /* copy extension buffer into buffer */ 113051a87c55SEric Van Hensbergen strncpy(buffer, st->extension, buflen); 11312bad8471SEric Van Hensbergen 1132bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, 113351a87c55SEric Van Hensbergen "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer); 1134bd238fb4SLatchesar Ionkov 11352511cd0bSMartin Stava retval = strnlen(buffer, buflen); 1136bd238fb4SLatchesar Ionkov done: 113762b2be59SLatchesar Ionkov p9stat_free(st); 1138bd238fb4SLatchesar Ionkov kfree(st); 11392bad8471SEric Van Hensbergen return retval; 11402bad8471SEric Van Hensbergen } 11412bad8471SEric Van Hensbergen 11422bad8471SEric Van Hensbergen /** 11432bad8471SEric Van Hensbergen * v9fs_vfs_follow_link - follow a symlink path 11442bad8471SEric Van Hensbergen * @dentry: dentry for symlink 11452bad8471SEric Van Hensbergen * @nd: nameidata 11462bad8471SEric Van Hensbergen * 11472bad8471SEric Van Hensbergen */ 11482bad8471SEric Van Hensbergen 11492bad8471SEric Van Hensbergen static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) 11502bad8471SEric Van Hensbergen { 11512bad8471SEric Van Hensbergen int len = 0; 11522bad8471SEric Van Hensbergen char *link = __getname(); 11532bad8471SEric Van Hensbergen 1154bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); 11552bad8471SEric Van Hensbergen 11562bad8471SEric Van Hensbergen if (!link) 11572bad8471SEric Van Hensbergen link = ERR_PTR(-ENOMEM); 11582bad8471SEric Van Hensbergen else { 115916cce6d2SLatchesar Ionkov len = v9fs_readlink(dentry, link, PATH_MAX); 11602bad8471SEric Van Hensbergen 11612bad8471SEric Van Hensbergen if (len < 0) { 1162ce44eeb6SDavi Arnaut __putname(link); 11632bad8471SEric Van Hensbergen link = ERR_PTR(len); 11642bad8471SEric Van Hensbergen } else 11652511cd0bSMartin Stava link[min(len, PATH_MAX-1)] = 0; 11662bad8471SEric Van Hensbergen } 11672bad8471SEric Van Hensbergen nd_set_link(nd, link); 11682bad8471SEric Van Hensbergen 11692bad8471SEric Van Hensbergen return NULL; 11702bad8471SEric Van Hensbergen } 11712bad8471SEric Van Hensbergen 11722bad8471SEric Van Hensbergen /** 11732bad8471SEric Van Hensbergen * v9fs_vfs_put_link - release a symlink path 11742bad8471SEric Van Hensbergen * @dentry: dentry for symlink 11752bad8471SEric Van Hensbergen * @nd: nameidata 1176ee443996SEric Van Hensbergen * @p: unused 11772bad8471SEric Van Hensbergen * 11782bad8471SEric Van Hensbergen */ 11792bad8471SEric Van Hensbergen 118053c06f4eSAneesh Kumar K.V void 1181ee443996SEric Van Hensbergen v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 11822bad8471SEric Van Hensbergen { 11832bad8471SEric Van Hensbergen char *s = nd_get_link(nd); 11842bad8471SEric Van Hensbergen 11856ff23207SDuane Griffin P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, 11866ff23207SDuane Griffin IS_ERR(s) ? "<error>" : s); 11872bad8471SEric Van Hensbergen if (!IS_ERR(s)) 1188ce44eeb6SDavi Arnaut __putname(s); 11892bad8471SEric Van Hensbergen } 11902bad8471SEric Van Hensbergen 1191ee443996SEric Van Hensbergen /** 1192ee443996SEric Van Hensbergen * v9fs_vfs_mkspecial - create a special file 1193ee443996SEric Van Hensbergen * @dir: inode to create special file in 1194ee443996SEric Van Hensbergen * @dentry: dentry to create 1195ee443996SEric Van Hensbergen * @mode: mode to create special file 1196ee443996SEric Van Hensbergen * @extension: 9p2000.u format extension string representing special file 1197ee443996SEric Van Hensbergen * 1198ee443996SEric Van Hensbergen */ 1199ee443996SEric Van Hensbergen 1200531b1094SLatchesar Ionkov static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1201531b1094SLatchesar Ionkov int mode, const char *extension) 1202531b1094SLatchesar Ionkov { 1203bd238fb4SLatchesar Ionkov u32 perm; 1204531b1094SLatchesar Ionkov struct v9fs_session_info *v9ses; 1205bd238fb4SLatchesar Ionkov struct p9_fid *fid; 1206531b1094SLatchesar Ionkov 12076a3124a3SLatchesar Ionkov v9ses = v9fs_inode2v9ses(dir); 1208dd6102fbSSripathi Kodi if (!v9fs_proto_dotu(v9ses)) { 1209bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n"); 12106a3124a3SLatchesar Ionkov return -EPERM; 1211531b1094SLatchesar Ionkov } 1212531b1094SLatchesar Ionkov 1213da977b2cSEric Van Hensbergen perm = unixmode2p9mode(v9ses, mode); 1214bd238fb4SLatchesar Ionkov fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1215bd238fb4SLatchesar Ionkov P9_OREAD); 1216bd238fb4SLatchesar Ionkov if (IS_ERR(fid)) 1217bd238fb4SLatchesar Ionkov return PTR_ERR(fid); 1218da977b2cSEric Van Hensbergen 1219bd238fb4SLatchesar Ionkov p9_client_clunk(fid); 12206a3124a3SLatchesar Ionkov return 0; 1221531b1094SLatchesar Ionkov } 1222531b1094SLatchesar Ionkov 1223531b1094SLatchesar Ionkov /** 1224531b1094SLatchesar Ionkov * v9fs_vfs_symlink - helper function to create symlinks 1225531b1094SLatchesar Ionkov * @dir: directory inode containing symlink 1226531b1094SLatchesar Ionkov * @dentry: dentry for symlink 1227531b1094SLatchesar Ionkov * @symname: symlink data 1228531b1094SLatchesar Ionkov * 1229ee443996SEric Van Hensbergen * See Also: 9P2000.u RFC for more information 1230531b1094SLatchesar Ionkov * 1231531b1094SLatchesar Ionkov */ 1232531b1094SLatchesar Ionkov 1233531b1094SLatchesar Ionkov static int 1234531b1094SLatchesar Ionkov v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 1235531b1094SLatchesar Ionkov { 1236bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, 1237bd238fb4SLatchesar Ionkov dentry->d_name.name, symname); 1238531b1094SLatchesar Ionkov 1239531b1094SLatchesar Ionkov return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); 1240531b1094SLatchesar Ionkov } 1241531b1094SLatchesar Ionkov 12422bad8471SEric Van Hensbergen /** 12432bad8471SEric Van Hensbergen * v9fs_vfs_link - create a hardlink 12442bad8471SEric Van Hensbergen * @old_dentry: dentry for file to link to 12452bad8471SEric Van Hensbergen * @dir: inode destination for new link 124673c592b9SEric Van Hensbergen * @dentry: dentry for link 12472bad8471SEric Van Hensbergen * 12482bad8471SEric Van Hensbergen */ 12492bad8471SEric Van Hensbergen 12502bad8471SEric Van Hensbergen static int 12512bad8471SEric Van Hensbergen v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 12522bad8471SEric Van Hensbergen struct dentry *dentry) 12532bad8471SEric Van Hensbergen { 1254531b1094SLatchesar Ionkov int retval; 1255bd238fb4SLatchesar Ionkov struct p9_fid *oldfid; 1256531b1094SLatchesar Ionkov char *name; 12572bad8471SEric Van Hensbergen 1258bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, 1259bd238fb4SLatchesar Ionkov " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, 12602bad8471SEric Van Hensbergen old_dentry->d_name.name); 12612bad8471SEric Van Hensbergen 1262da977b2cSEric Van Hensbergen oldfid = v9fs_fid_clone(old_dentry); 1263da977b2cSEric Van Hensbergen if (IS_ERR(oldfid)) 1264da977b2cSEric Van Hensbergen return PTR_ERR(oldfid); 12652bad8471SEric Van Hensbergen 1266531b1094SLatchesar Ionkov name = __getname(); 1267da977b2cSEric Van Hensbergen if (unlikely(!name)) { 1268da977b2cSEric Van Hensbergen retval = -ENOMEM; 1269da977b2cSEric Van Hensbergen goto clunk_fid; 1270da977b2cSEric Van Hensbergen } 12710710d36aSFlorin Malita 127216cce6d2SLatchesar Ionkov sprintf(name, "%d\n", oldfid->fid); 1273bd238fb4SLatchesar Ionkov retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1274531b1094SLatchesar Ionkov __putname(name); 12752bad8471SEric Van Hensbergen 1276da977b2cSEric Van Hensbergen clunk_fid: 1277bd238fb4SLatchesar Ionkov p9_client_clunk(oldfid); 12782bad8471SEric Van Hensbergen return retval; 12792bad8471SEric Van Hensbergen } 12802bad8471SEric Van Hensbergen 12812bad8471SEric Van Hensbergen /** 12822bad8471SEric Van Hensbergen * v9fs_vfs_mknod - create a special file 12832bad8471SEric Van Hensbergen * @dir: inode destination for new link 12842bad8471SEric Van Hensbergen * @dentry: dentry for file 12852bad8471SEric Van Hensbergen * @mode: mode for creation 1286ee443996SEric Van Hensbergen * @rdev: device associated with special file 12872bad8471SEric Van Hensbergen * 12882bad8471SEric Van Hensbergen */ 12892bad8471SEric Van Hensbergen 12902bad8471SEric Van Hensbergen static int 12912bad8471SEric Van Hensbergen v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) 12922bad8471SEric Van Hensbergen { 1293531b1094SLatchesar Ionkov int retval; 1294531b1094SLatchesar Ionkov char *name; 12952bad8471SEric Van Hensbergen 1296bd238fb4SLatchesar Ionkov P9_DPRINTK(P9_DEBUG_VFS, 1297bd238fb4SLatchesar Ionkov " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, 12982bad8471SEric Van Hensbergen dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); 12992bad8471SEric Van Hensbergen 1300531b1094SLatchesar Ionkov if (!new_valid_dev(rdev)) 1301531b1094SLatchesar Ionkov return -EINVAL; 130273c592b9SEric Van Hensbergen 1303531b1094SLatchesar Ionkov name = __getname(); 1304c0291a05SEugene Teo if (!name) 1305c0291a05SEugene Teo return -ENOMEM; 13062bad8471SEric Van Hensbergen /* build extension */ 13072bad8471SEric Van Hensbergen if (S_ISBLK(mode)) 1308531b1094SLatchesar Ionkov sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 13092bad8471SEric Van Hensbergen else if (S_ISCHR(mode)) 1310531b1094SLatchesar Ionkov sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 131173c592b9SEric Van Hensbergen else if (S_ISFIFO(mode)) 1312531b1094SLatchesar Ionkov *name = 0; 131375cc5c9bSVenkateswararao Jujjuri else if (S_ISSOCK(mode)) 131475cc5c9bSVenkateswararao Jujjuri *name = 0; 13152bad8471SEric Van Hensbergen else { 1316531b1094SLatchesar Ionkov __putname(name); 1317531b1094SLatchesar Ionkov return -EINVAL; 13182bad8471SEric Van Hensbergen } 13192bad8471SEric Van Hensbergen 1320531b1094SLatchesar Ionkov retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); 1321531b1094SLatchesar Ionkov __putname(name); 13222bad8471SEric Van Hensbergen 13232bad8471SEric Van Hensbergen return retval; 13242bad8471SEric Van Hensbergen } 13252bad8471SEric Van Hensbergen 13269b6533c9SSripathi Kodi static const struct inode_operations v9fs_dir_inode_operations_dotu = { 13279b6533c9SSripathi Kodi .create = v9fs_vfs_create, 13289b6533c9SSripathi Kodi .lookup = v9fs_vfs_lookup, 13299b6533c9SSripathi Kodi .symlink = v9fs_vfs_symlink, 133050cc42ffSVenkateswararao Jujjuri (JV) .link = v9fs_vfs_link, 13319b6533c9SSripathi Kodi .unlink = v9fs_vfs_unlink, 13329b6533c9SSripathi Kodi .mkdir = v9fs_vfs_mkdir, 13339b6533c9SSripathi Kodi .rmdir = v9fs_vfs_rmdir, 13341d76e313SAneesh Kumar K.V .mknod = v9fs_vfs_mknod, 13359b6533c9SSripathi Kodi .rename = v9fs_vfs_rename, 13369b6533c9SSripathi Kodi .getattr = v9fs_vfs_getattr, 13379b6533c9SSripathi Kodi .setattr = v9fs_vfs_setattr, 13389b6533c9SSripathi Kodi }; 13399b6533c9SSripathi Kodi 1340754661f1SArjan van de Ven static const struct inode_operations v9fs_dir_inode_operations = { 1341b501611aSEric Van Hensbergen .create = v9fs_vfs_create, 1342b501611aSEric Van Hensbergen .lookup = v9fs_vfs_lookup, 1343b501611aSEric Van Hensbergen .unlink = v9fs_vfs_unlink, 1344b501611aSEric Van Hensbergen .mkdir = v9fs_vfs_mkdir, 1345b501611aSEric Van Hensbergen .rmdir = v9fs_vfs_rmdir, 1346b501611aSEric Van Hensbergen .mknod = v9fs_vfs_mknod, 1347b501611aSEric Van Hensbergen .rename = v9fs_vfs_rename, 1348b501611aSEric Van Hensbergen .getattr = v9fs_vfs_getattr, 1349b501611aSEric Van Hensbergen .setattr = v9fs_vfs_setattr, 1350b501611aSEric Van Hensbergen }; 1351b501611aSEric Van Hensbergen 1352754661f1SArjan van de Ven static const struct inode_operations v9fs_file_inode_operations = { 13532bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 13542bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 13552bad8471SEric Van Hensbergen }; 13562bad8471SEric Van Hensbergen 1357754661f1SArjan van de Ven static const struct inode_operations v9fs_symlink_inode_operations = { 1358204f2f0eSAl Viro .readlink = generic_readlink, 13592bad8471SEric Van Hensbergen .follow_link = v9fs_vfs_follow_link, 13602bad8471SEric Van Hensbergen .put_link = v9fs_vfs_put_link, 13612bad8471SEric Van Hensbergen .getattr = v9fs_vfs_getattr, 13622bad8471SEric Van Hensbergen .setattr = v9fs_vfs_setattr, 13632bad8471SEric Van Hensbergen }; 13649b6533c9SSripathi Kodi 1365